# Relationship history for MSHA mine 1103078

Current hierarchy: **Robert  Narvick; Barry  Narvick → Narvick Brothers Lumber Company Inc → NARVICK PORTABLE CRUSHER**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Narvick Brothers Lumber Company Inc → NARVICK PORTABLE CRUSHER; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Narvick et al → NARVICK PORTABLE CRUSHER; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Narvick et al → Narvick Brothers Lumber Company Inc; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barry  Narvick et al → Narvick Brothers Lumber Company Inc; 2000-12-01 to current/open; source msha-controller-operator-history